LE E17 to E26 Light Socket Adapter, Bulb Base Converter, Pack of 6 Pack of 6 Units Easytoinstall.SimplyscrewthesocketadapterintoE17typesocket,andthenscrew in anE26bulb. Enlarge the light bulb socket. Enlarge the intermediate socket (E17) to medium socket (E26). Widely used. Works with incandescent, CFL (Energy Efficient) bulbs and LED bulbs. Dimensions: 2.52 x 1.55 inch / 6.4 x 3.93 cm (L x Dia)